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共用题干 The Greatest Mystery of WhalesThe whale is a warm-blooded,air-breathing...

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问题 共用题干
The Greatest Mystery of Whales
The whale is a warm-blooded,air-breathing animal,giving birth to its young alive,sucking them-and, like all mammals,originated on land.There are many______(51)of this.Its front flippers（鳍状肢）, used for steering and stability,are traces of feet.
Immense strength is______(52)into the great body of the big whales,and in fact most of a whale's body is one gigantic muscle.The blue whale's pulling strength has been estimated______(53) 400 horsepower.One specimen was reported to have towed（拖）a whaling vessel for seven hours at the ______(54)of eight knot（节）.
An angry whale will______(55).A famous example of this was the fate of Whaler Essex, ______(56)was sunk off the coast of South America early in the last century.More recently,steel ships have______( 57 ) their plates buckled（使弯曲）in the same way.Sperm whales（抹香鲸）were known to seize the old-time whaleboats in their jaws and crush them.
The greatest______(58)of whales is their diving ability.The sperm whale dives to the bottom for his______( 59 ) food , the octopus（章鱼）.In that search he is known to go as far down as 3 , 200 feet, where the______(60)is 1,400 pounds to a square inch.Doing so he will______(61) underwater as long as one hour.Two special skills are involved in this storing up enough______(62) (all whales are air-breathed)and tolerating thern great change in pressure.Just how he does it scientists have not______(63).It is believed that some of the oxygen is stored in a special ______(64)of blood vessels,rather than just held in the lungs.And it is believed that a special kind of oi1 in his head is some sort of a compensating mechanism that______(65)adjusts the internal pressure of his body.But since you can't bring a live whale into the laboratory for study,no one knows just how these things work.
选项 56._________
A:as
B:who
C:which
D:that
答案C
解析第一段讲到鲸鱼很像陆地上的哺乳动物，最后一句举了一个例子来说明这一点。sign的意思是“符号，特征，迹象”，鲸鱼具有陆地上哺乳动物的一些特征，故选B项。aspect方面，层面；way方法，方式；reason原因。
sth.is built into…的意思是“使……成为……的组成部分”，这里指鲸鱼具有巨大的气力。其他几个选项意思上讲不通。work工作，运行；divide划分；move移动。
at表示“（速度、比率等）以，达”; horsepower表示“马力”。
rate表示“速度”，而空格后的“knot”是速度单位，所以此处选D项。number数字；degree程度；distance距离。
此处表示鲸鱼被惹怒后会进行攻击，所以选B项。abandon放弃；attack攻击; leave离开；board登（船）。
这里是一个非限制性定语从句，修饰Whaler Essex，且在从句中作主语，故应用which来引导，故选C项。
" have + sth.+过去分词”是常用表达，表示某事被做。operate操作；see看见；catch抓住。
本题所在句子为该段主题句，谈的是鲸鱼的潜水能力。鲸鱼的潜水能力很强，能下潜到很深的地方，科学家们对其原因不解，所以说是个谜，故选D项。interest兴趣;job工作；danger危险。
虽然本题的几个选项都能与food搭配，但从上下文意思来讲，只有A项正确。favorite最喜爱的；fast快速的；new新的；sufficient充足的。
空格后面说的是每平方英寸1400磅，用的是压强单位，故选B项。depth深度；pressure压强；level水平；size尺寸。
待在水下要用动词remain，其他几个动词放入空格处意思讲不通。set设置沙ecome变为；rest休息。
这里指鲸鱼储存氧气，故选D项。heat热量；energy能量；food食物；oxygen氧气。
此处意为：鲸鱼为什么能够在水下承受巨大的压力，科学家们还没有找到答案。选项中的determine的意思是“确定”，此词放入空格处意思讲得通，其他几个选项讲不通，故选B项。witness见证；apply运用；calculate计算。
此处是指氧气存在特殊的血管系统中，故A项为正确答案。system系统；place地方；arrangement安排；equipment设备。
此处意为：这种补偿结构能自动调节鲸鱼体内的压力。automatically的意思是“自动地”，符合题意。mentally心理上；artificially人工地；manually手工地。
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